Question

In heterozygous condition, the individual expression of both the alleles in the phenotype is exemplified by:

• A. Colorblindness
• B. AB blood groups
• C. Rh factor
• D. A and B blood group

Answer 1

The correct option is B

AB blood groups

The correct option is B:

Explanation of the correct option:

1. The expression of phenotypes from both parents in a heterozygous state is called codominance.
2. Examples: ABO blood group, sickle cell anemia, and seed coats of lentils.

Explanation of the incorrect options:

Option A:

Colour blindness is inherited as a recessive trait on the X chromosome which is known in genetics as X-linked recessive inheritance.

Option C:

The Rh positive gene is dominant over the Rh negative gene, therefore Rh positive takes over.

Option D:

1. The A and B genes are dominant and the O gene is recessive.
2. For example, if an O gene is paired with an A gene, the blood type is A.

Final answer: In heterozygous condition, the individual expression of both the alleles in the phenotype is exemplified by AB blood groups.